AMI INSPECTOR pH
Maintenance
A-96.250.761 / 161017 31
6.4. Calibration
Process
pH Calibration
The process calibration is based on a comparative measurement of
the on-line instrument with a calibrated comparative electrode. Per-
form a valid manual measurement with the calibrated comparative
electrode. Then compare the measuring value with the on-line in-
strument and if necessary, enter the correct measuring value in the
menu <Maintenance/Electrode 1/2/Process Cal.> of the on-line in-
strument.
The deviation of the measuring values is shown as offset in mV.
Select <Save> and press <Enter> to save the correct measuring
value.
Standard
pH Calibration
The ideal pH electrode has an offset of 0 mV at pH 7 and a slope of
59.16 mV/pH unit. Real electrodes differ from this ideal. Therefore,
pH electrodes are calibrated with two buffer solutions, of different
pH values.
.
pH
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
-59
59
-118
118
-177
177
-236
-295
-354
-413
mV
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